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Ionic liquid-functionalized LDH as catalytic-initiating nanoparticles for microwave-activated ring opening polymerization of .epsilon.-caprolactone
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SYSNO ASEP 0522716 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Ionic liquid-functionalized LDH as catalytic-initiating nanoparticles for microwave-activated ring opening polymerization of .epsilon.-caprolactone Author(s) Bujok, Sonia (UMCH-V) ORCID, RID
Konefal, Magdalena (UMCH-V) ORCID, RID
Abbrent, Sabina (UMCH-V) RID, ORCID
Pavlova, Ewa (UMCH-V) RID
Svoboda, Jan (UMCH-V) ORCID, RID
Trhlíková, Olga (UMCH-V) RID, ORCID
Walterová, Zuzana (UMCH-V)
Beneš, Hynek (UMCH-V) RID, ORCIDSource Title Reaction Chemistry & Engineering. - : Royal Society of Chemistry - ISSN 2058-9883
Roč. 5, č. 3 (2020), s. 506-518Number of pages 13 s. Language eng - English Country GB - United Kingdom Keywords polycaprolactone ; ring opening polymerization ; layered double hydroxides Subject RIV CD - Macromolecular Chemistry OECD category Polymer science R&D Projects GA17-08273S GA ČR - Czech Science Foundation (CSF) LO1507 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Limited access Institutional support UMCH-V - RVO:61389013 UT WOS 000519210200004 EID SCOPUS 85081132521 DOI 10.1039/C9RE00399A Annotation The paper is focused on investigation of layered double hydroxides (LDH) functionalized with ionic liquid (IL) as novel catalytic/initiating system for ring opening polymerization (ROP) of ε-caprolactone. Firstly, the Ca2+/Al3+ LDH nanoparticles were synthesized via a co-precipitation method followed by the anion exchange using phosphonium IL with decanoate anions producing the modified LDH with interlayered IL-anions. Then, the progress of microwave-assisted polymerization in the presence of the modified LDH was studied showing the anionic mechanism of ROP initiated by the water molecules, which were adsorbed on the LDH surface and intercalated in the LDH galleries. The whole polymerization was significantly accelerated by microwave energy, which induced molecular rotations of the intercalated IL-anions leading to LDH delamination and exfoliation into individual nanosheets, which made the catalytic sites (IL-anions) easily accessible for the εCL molecules. The kinetics of microwave-assisted ROP thus showed a 4.6-fold increase of the reaction rate compared to the polymerization performed under conventional heating. Activation enthalpy and entropy were calculated for the microwave-assisted polymerizations initiated by the modified LDH. The use of microwave-active catalytic-initiating LDH nanoparticles enables to synthesize the organometallic catalyst-free PCL or, at higher LDH loadings, the highly-exfoliated PCL/LDH nanocomposites, which are highly desirable for e.g. packaging materials. Workplace Institute of Macromolecular Chemistry Contact Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Year of Publishing 2021 Electronic address https://pubs.rsc.org/en/content/articlelanding/2020/RE/C9RE00399A#!divAbstract
Number of the records: 1